What does it mean if i have blood shot eyes?

Dryness: Fatigue lowers the tear flow and causes some eye redness. As long as your vision is not affected or the eyes do not hurt or have pus in them, then you can wait a few days for it to clear. And get some relief from topical lubricant eyedrops. If persistent then see your ophthalmologist.

Lots of causes: Red eyes can simply be from dry eye syndrome (common in women, especially peri or post menopausal). Other causes include eyelid inflammation (blepharitis) or infection.

Many things: Eyes get bloodshot in response to inflammation. The cause of inflammation can be a huge number of things including infection, dryness, misuse of contanct lenses, allergy etc. There is no way to tell what the cause is unless one examines the eye for evidence of what is causing the inflammation. Consult your eye doctor and avoid over the counter treatments other than lubricating drops.